IMP5HCD - the IMP5 Composite Actor for Heating and Current Drive

Physics actors in IMP5HCD

Here follows a list of the heating and current drive actor released in the imp5hcd composite actor that have passed at least some elementary robustness tests and in most cases some form of verification. This list is likely to change within a few month time. For the latest details contact Thomas Johnson.

Date of last update: 2014-12-19

Non-physics actors in IMP5HCD

UNDER DEVELOPMENTS

Composite Actor for Waves

Wave field solvers in the IMP5 Composite Actor for Heating and Current Drive are collected in a composite actor, which in turns separates the different heating schemes ICRF, LH and ECRH. The three waves fields are then joined by a datajoiner for the waves CPO.

As an example we here show how the ECRH composite actor select the physics code to use from a long list. The variable that determines the selection is a global parameter ec_wave_code, set at the top-level of the composite actor IMP5HCD. Note that if you run IMP5HCD in the ETS ec_wave_code is set on a higher level.

When selecting ec_wave_code=gray the workflow will entre the Gray model composite actor containing the Gray code, a ray tracer for EC waves.

Composite Actor for Fokker-Planck

The composite actor for Fokker-Planck solvers are separated into solver for the electron and ion distribution function

As an example is shown below the composite actor for the ion-Fokker Planck solvers. This solvers allows two different ways of operation, either the full Fokker-Planck equation is solved including both wave field acceleration and particle source terms (the box "Ion Fokker-Planck wave + particle source" in the figure), or alternatively the two effects (wave acceleration and particle source terms) are treated seperately in two different solver (...in the figure).

Next looking more carefully what's inside e.g. the "Ion Fokker-Planck particle source" box we find again both an Empty CPO Generator and a long list physics codes to choose between: nbisim, risk, spot, ascot4serial, ascot4parallel.

Finally, inside the NBISIM composite actor you find the nbisim actor.

CPOs-fields required for the IMP5HCD composite actor

An Actor running under IMP5HCD have to fill in certain fields, or else the workflow will not work properly. Here follows a list of requirements in 4.08b, using Fortran notation; for C, Java, or matlab notation replace "%" by "." (a dot).

• waves(.)%coherentwave(.)%grid_1d%rho_tor
  is required by imp5coresource. If this field is not filled, then the data in waves(.)%coherentwave(.) will be discarded in the coresource output.

Error handling

When building advanced workflows like the IMP5HCD it is imparative that the individual components are robust and behaves in a controlled manner, even when the input is outside the conditions for validity. For this reason the ITM strongly encourage defensive programming.

The output of any ITM actor should in addition always provide error messages the output CPOs. Every CPO therefore includes a derived datatype called codeparam (located directly under the root of every CPO), which contains the field output_flag in which the error flag should be stored, see above.